People has confirmed that the actress' 34-year-old fiancé, John Dineen, has died.
The Irish public relations executive passed away on Sunday after a battle with a rare form of cancer, which he had been diagnosed with earlier this year. According to the Irish Independent, Dockery was at his bedside until the end.
Rather tragically, today is Michelle's 34th birthday.
She and John's family released an official statement Tuesday, which reads, "The family is very grateful for the support and kindness they have received but would kindly request that they are left to grieve in private."
Just last week, Michelle was seen on multiple late night and entertainment news shows promoting the upcoming American premiere of Abbey's final season.
She and Dineen had been dating since 2013 and never officially announced their engagement.
Our thoughts and prayers go out to Michelle, and Dineen's family and friends.